Glog

Rust logging in the pattern established by Google logging. See http://github.com/golang/glog and https://github.com/google/glog

TODO

• -alsologtostderr
• -colorlogtostderr this implies color support.
• -log_backtrace_at
• -log_dir
• -logbuflevel
• -logbufsecs
• -logfile_mode
• -logtostderr
• -max_log_size this implies log rotation.
• -minloglevel
• -stderrthreshold
• -stop_logging_if_full_disk
• -timestamp_in_logfile_name
• -v
• -vmodule
• flush / sync behavior matching Go or C++ implementations.
• various wrappers for conditional logging (i.e. log_if, sample based). TODO(wathiede): breakout into subcheckboxes.

Not implemented

These are things that seem unnecessary or low priority for the rust version.

• raw log mode that doesn't allocate or use locking primitives
• numeric logging levels, rust offers debug and trace beyond info, and also target based logging.